{"id":15814,"date":"2026-05-26T23:51:32","date_gmt":"2026-05-26T22:51:32","guid":{"rendered":"https:\/\/www.smithersofstamford.com\/blog\/?p=15814"},"modified":"2026-06-11T23:47:46","modified_gmt":"2026-06-11T22:47:46","slug":"how-to-clean-sash-windows-from-inside-without-damaging-them","status":"publish","type":"post","link":"https:\/\/www.smithersofstamford.com\/blog\/how-to-clean-sash-windows-from-inside-without-damaging-them\/","title":{"rendered":"How to Clean Sash Windows From Inside Without Damaging Them"},"content":{"rendered":"<div class=\"sws_supernormalaction\"><button on=\"tap:superwebshare-lightbox\" class=\"superwebshare_normal_button1 superwebshare-button-large superwebshare-button-default superwebshare_prompt superwebshare_button_svg\" style=\"color:#ffffff;background-color: #1e73be;\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"superwebshare-svg\"  fill=\"currentColor\" viewBox=\"0 0 1000 1000\" stroke=\"currentColor\" stroke-width=\"0\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M789.86,323.67c91.79,0,164.25-72.46,164.25-164.25S881.64,0,789.86,0S625.6,72.46,625.6,164.25c0,4.83,0,14.49,0,24.15L306.76,371.98c-24.15-24.15-57.97-33.82-96.62-33.82c-91.79,0-164.25,72.46-164.25,164.25s72.46,164.25,164.25,164.25c38.65,0,72.46-14.49,96.62-33.82L625.6,821.26c0,9.66,0,14.49,0,19.32c0,86.96,72.46,159.42,159.42,159.42s159.42-72.46,159.42-159.42s-67.63-159.42-154.59-159.42c-33.82,0-67.63,9.66-96.62,33.82L374.4,526.57c0-9.66,0-19.32,0-24.15s0-14.49,0-24.15l318.84-188.41C717.39,314.01,751.21,323.67,789.86,323.67z\" \/><\/svg><span>Share<\/span><\/button><\/div><p data-start=\"63\" data-end=\"422\"><a href=\"https:\/\/www.njsash.co.uk\/p\/sash-window-repairs-stamford.html\">Traditional sash windows<\/a> can look stunning on Georgian and Victorian homes, but cleaning them properly is not always as straightforward as modern windows. If you have ever wondered <strong data-start=\"244\" data-end=\"285\">how to clean sash windows from inside<\/strong>, the good news is that most traditional sash windows were actually designed to make cleaning easier \u2014 if they are functioning correctly.<a href=\"https:\/\/www.njsash.co.uk\/2026\/05\/how-to-clean-sash-windows-from-inside.html\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-15815 aligncenter\" src=\"https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/how-to-clean-sash-windows.png\" alt=\"\" width=\"1536\" height=\"1024\" srcset=\"https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/how-to-clean-sash-windows.png 1536w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/how-to-clean-sash-windows-300x200.png 300w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/how-to-clean-sash-windows-1024x683.png 1024w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/how-to-clean-sash-windows-768x512.png 768w\" sizes=\"auto, (max-width: 1536px) 100vw, 1536px\" \/><\/a><\/p>\n<p data-start=\"424\" data-end=\"436\">The problem?<\/p>\n<p data-start=\"438\" data-end=\"621\">Many older timber windows have become stiff, painted shut or simply neglected over the years, meaning homeowners often end up <a href=\"https:\/\/brighton-seo.com\/seo-company-for-window-cleaning-how-window-cleaners-get-more-customers-online\/\">cleaning windows<\/a> the wrong way or causing accidental damage.<\/p>\n<p data-start=\"623\" data-end=\"814\">We asked <strong data-start=\"632\" data-end=\"668\">Nick Smith from <a href=\"https:\/\/www.njsash.co.uk\/p\/sash-window-repairs-stamford.html\">NJS Sash Windows<\/a><\/strong>, a traditional sash window restoration specialist established since 2005, for his advice on how homeowners should care for original sash windows.<\/p>\n<h2 data-section-id=\"1kzp5w0\" data-start=\"816\" data-end=\"858\">First, Understand How Sash Windows Work<\/h2>\n<p data-start=\"860\" data-end=\"925\">Traditional sash windows operate differently from modern windows.<\/p>\n<p data-start=\"927\" data-end=\"970\">Most period sash windows are designed with:<\/p>\n<ul data-start=\"972\" data-end=\"1048\">\n<li data-section-id=\"oyr0vb\" data-start=\"972\" data-end=\"1010\">A <strong data-start=\"976\" data-end=\"1010\">bottom sash that slides upward<\/strong><\/li>\n<li data-section-id=\"akzlo4\" data-start=\"1011\" data-end=\"1048\">A <strong data-start=\"1015\" data-end=\"1048\">top sash that slides downward<\/strong><\/li>\n<\/ul>\n<p data-start=\"1050\" data-end=\"1169\">This design allows airflow and, importantly, gives access to clean much of the external glass from inside the property.<\/p>\n<p data-start=\"1171\" data-end=\"1209\">However, older sash windows are often:<\/p>\n<ul data-start=\"1211\" data-end=\"1302\">\n<li data-section-id=\"6pbn75\" data-start=\"1211\" data-end=\"1227\">Painted shut<\/li>\n<li data-section-id=\"dn5dl9\" data-start=\"1228\" data-end=\"1249\">Difficult to open<\/li>\n<li data-section-id=\"91c3dp\" data-start=\"1250\" data-end=\"1282\">Sticking from swollen timber<\/li>\n<li data-section-id=\"16rjpww\" data-start=\"1283\" data-end=\"1302\">Loose or rattling<\/li>\n<\/ul>\n<p data-start=\"1304\" data-end=\"1499\">\u201cPeople often try forcing them,\u201d says Nick. \u201cThat\u2019s one of the worst things you can do because if there\u2019s paint build-up, damaged cords or swelling timber, you can easily make the problem worse.\u201d<\/p>\n<h2 data-section-id=\"1r1z4v\" data-start=\"1501\" data-end=\"1520\">What You\u2019ll Need<\/h2>\n<p data-start=\"1522\" data-end=\"1588\"><a href=\"https:\/\/www.njsash.co.uk\/2026\/05\/how-to-clean-sash-windows-from-inside.html\">Cleaning sash windows<\/a> properly doesn\u2019t require expensive products.<\/p>\n<p data-start=\"1590\" data-end=\"1628\">Nick recommends keeping things simple:<\/p>\n<ul data-start=\"1630\" data-end=\"1781\">\n<li data-section-id=\"1sbu6k4\" data-start=\"1630\" data-end=\"1644\">Warm water<\/li>\n<li data-section-id=\"xjhbsd\" data-start=\"1645\" data-end=\"1671\">Mild washing-up liquid<\/li>\n<li data-section-id=\"mx63uj\" data-start=\"1672\" data-end=\"1708\">Soft cloths or microfibre cloths<\/li>\n<li data-section-id=\"1p26gwd\" data-start=\"1709\" data-end=\"1738\">Kitchen roll or dry cloth<\/li>\n<li data-section-id=\"nndibr\" data-start=\"1739\" data-end=\"1770\">A soft brush for the tracks<\/li>\n<li data-section-id=\"1ccg1nr\" data-start=\"1771\" data-end=\"1781\">A bucket<\/li>\n<\/ul>\n<p data-start=\"1783\" data-end=\"1831\">Avoid harsh cleaning chemicals or abrasive pads.<\/p>\n<p data-start=\"1833\" data-end=\"1969\">\u201cOlder timber windows don\u2019t like aggressive products,\u201d says Nick. \u201cYou want to protect the paintwork and the timber, not strip it back.\u201d<\/p>\n<h2 data-section-id=\"4vmdtu\" data-start=\"1971\" data-end=\"2007\">Step 1: Open the Window Carefully<img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-15670 aligncenter\" src=\"https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/njs-nick-smith-stamford-sash-window.jpg\" alt=\"\" width=\"2000\" height=\"1305\" srcset=\"https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/njs-nick-smith-stamford-sash-window.jpg 2000w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/njs-nick-smith-stamford-sash-window-300x196.jpg 300w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/njs-nick-smith-stamford-sash-window-1024x668.jpg 1024w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/njs-nick-smith-stamford-sash-window-768x501.jpg 768w, https:\/\/www.smithersofstamford.com\/blog\/wp-content\/uploads\/2026\/05\/njs-nick-smith-stamford-sash-window-1536x1002.jpg 1536w\" sizes=\"auto, (max-width: 2000px) 100vw, 2000px\" \/><\/h2>\n<p data-start=\"2009\" data-end=\"2051\">To clean sash windows from inside, gently:<\/p>\n<ol data-start=\"2053\" data-end=\"2101\">\n<li data-section-id=\"12df7m1\" data-start=\"2053\" data-end=\"2079\">Raise the bottom sash<\/li>\n<li data-section-id=\"1ev6oo1\" data-start=\"2080\" data-end=\"2101\">Lower the top sash<\/li>\n<\/ol>\n<p data-start=\"2103\" data-end=\"2191\">This gives better access to much of the outer glass without leaning dangerously outside.<\/p>\n<p data-start=\"2193\" data-end=\"2219\">If the window feels stiff:<\/p>\n<p data-start=\"2221\" data-end=\"2226\">Stop.<\/p>\n<p data-start=\"2228\" data-end=\"2396\">\u201cDon\u2019t force an old sash window,\u201d Nick explains. \u201cThere\u2019s usually a reason it\u2019s sticking. Sometimes it\u2019s just layers of paint, sometimes worn cords or timber movement.\u201d<\/p>\n<h2 data-section-id=\"f3fhms\" data-start=\"2398\" data-end=\"2431\">Step 2: Clean the Glass Gently<\/h2>\n<p data-start=\"2433\" data-end=\"2494\">Warm water with a little washing-up liquid is usually enough.<\/p>\n<p data-start=\"2496\" data-end=\"2576\">Wipe the glass carefully and dry afterwards with a clean cloth to avoid streaks.<\/p>\n<p data-start=\"2578\" data-end=\"2640\">One mistake many people make is soaking the frame too heavily.<\/p>\n<p data-start=\"2642\" data-end=\"2771\">\u201cToo much water around older timber is never ideal,\u201d says Nick. \u201cYou especially don\u2019t want water sitting around joints or sills.\u201d<\/p>\n<h2 data-section-id=\"1qobvn4\" data-start=\"2773\" data-end=\"2818\">Step 3: Don\u2019t Forget the Tracks and Timber<\/h2>\n<p data-start=\"2820\" data-end=\"2873\">Dust and debris often collect in sash window runners.<\/p>\n<p data-start=\"2875\" data-end=\"2894\">A quick clean with:<\/p>\n<ul data-start=\"2896\" data-end=\"2956\">\n<li data-section-id=\"k5n01l\" data-start=\"2896\" data-end=\"2912\">A soft brush<\/li>\n<li data-section-id=\"ssnjw8\" data-start=\"2913\" data-end=\"2934\">Hoover attachment<\/li>\n<li data-section-id=\"10ljyhg\" data-start=\"2935\" data-end=\"2956\">Slightly damp cloth<\/li>\n<\/ul>\n<p data-start=\"2958\" data-end=\"2984\">can help improve movement.<\/p>\n<p data-start=\"2986\" data-end=\"3036\">While cleaning, take the opportunity to check for:<\/p>\n<ul data-start=\"3038\" data-end=\"3109\">\n<li data-section-id=\"18stuyr\" data-start=\"3038\" data-end=\"3053\">Soft timber<\/li>\n<li data-section-id=\"1v8kzwz\" data-start=\"3054\" data-end=\"3071\">Cracked paint<\/li>\n<li data-section-id=\"1lxms3a\" data-start=\"3072\" data-end=\"3088\">Water damage<\/li>\n<li data-section-id=\"1erp0vf\" data-start=\"3089\" data-end=\"3109\">Early signs of rot<\/li>\n<\/ul>\n<p data-start=\"3111\" data-end=\"3192\">Small repairs caught early are normally much easier \u2014 and cheaper \u2014 to deal with.<\/p>\n<h2 data-section-id=\"7ui5z1\" data-start=\"3194\" data-end=\"3263\">Avoid Modern Water-Fed Pole Window Cleaning on Timber Sash Windows<\/h2>\n<p data-start=\"3265\" data-end=\"3436\">One of the biggest mistakes Nick sees homeowners make is hiring window cleaners who use <strong data-start=\"3353\" data-end=\"3390\">modern telescopic water-fed poles<\/strong>, soaking traditional windows from the ground.<\/p>\n<p data-start=\"3438\" data-end=\"3545\">While this may work perfectly on modern UPVC houses, it is not always ideal for period <a title=\"How to Find a Good Traditional Company to Restore Your Sash Windows\" href=\"https:\/\/www.smithersofstamford.com\/blog\/how-to-find-a-good-traditional-company-to-restore-your-sash-windows\/\" rel=\"\">timber sash windows<\/a>.<\/p>\n<p data-start=\"3547\" data-end=\"3896\">\u201cOne mistake I see homeowners make is treating traditional sash windows like modern UPVC,\u201d says Nick. \u201cPeople often hire window cleaners using telescopic water-fed poles that absolutely soak the frames and sills with water. On older timber sash windows, repeated soaking can eventually contribute to paint failure, moisture problems and timber rot.\u201d<\/p>\n<p data-start=\"3898\" data-end=\"3943\">Instead, Nick recommends traditional methods.<\/p>\n<p data-start=\"3945\" data-end=\"4130\">\u201cSash windows are usually best cleaned by hand using traditional window cleaning methods. You don\u2019t want water sitting around joints, sills or vulnerable timber areas for long periods.\u201d<\/p>\n<p data-start=\"4132\" data-end=\"4233\">Traditional hand cleaning also makes it easier to spot problems before they become expensive repairs.<\/p>\n<h2 data-section-id=\"1xq0ub0\" data-start=\"4235\" data-end=\"4271\">Can Old Sash Windows Be Restored?<\/h2>\n<p data-start=\"4273\" data-end=\"4284\">Absolutely.<\/p>\n<p data-start=\"4286\" data-end=\"4393\">Many homeowners assume original timber windows need replacing when, in reality, they simply need restoring.<\/p>\n<p data-start=\"4395\" data-end=\"4510\">Established since <strong data-start=\"4413\" data-end=\"4421\">2005<\/strong>, <strong data-start=\"4423\" data-end=\"4443\">NJS Sash Windows<\/strong> regularly restores traditional timber sash windows suffering from:<\/p>\n<ul data-start=\"4512\" data-end=\"4623\">\n<li data-section-id=\"1dnhgkb\" data-start=\"4512\" data-end=\"4529\">Rotten timber<\/li>\n<li data-section-id=\"1vwm60n\" data-start=\"4530\" data-end=\"4551\">Broken sash cords<\/li>\n<li data-section-id=\"srs1ip\" data-start=\"4552\" data-end=\"4572\">Sticking windows<\/li>\n<li data-section-id=\"kbtpqa\" data-start=\"4573\" data-end=\"4585\">Draughts<\/li>\n<li data-section-id=\"1oq5vx3\" data-start=\"4586\" data-end=\"4602\">Rotten sills<\/li>\n<li data-section-id=\"1u048c\" data-start=\"4603\" data-end=\"4623\">Worn timber joints<\/li>\n<\/ul>\n<p data-start=\"4625\" data-end=\"4771\">The company regularly works across <strong data-start=\"4660\" data-end=\"4735\">Stamford, Rutland, Peterborough, Cambridge and selected London projects<\/strong>, including period and listed homes.<\/p>\n<p data-start=\"4773\" data-end=\"4957\">Nick recently worked on restoring windows for a <em data-start=\"4821\" data-end=\"4859\">Grade II listed property in Camden<\/em>*, carefully preserving the building\u2019s original character while repairing damaged timber sections.<\/p>\n<h2 data-section-id=\"114wazr\" data-start=\"4959\" data-end=\"4976\">Final Thoughts<\/h2>\n<p data-start=\"4978\" data-end=\"5124\">Learning <strong data-start=\"4987\" data-end=\"5028\">how to clean sash windows from inside<\/strong> is not just about sparkling glass \u2014 it is about protecting traditional timber windows properly.<\/p>\n<p data-start=\"5126\" data-end=\"5270\">A careful approach, traditional cleaning methods and avoiding excessive moisture can help preserve original sash windows for many years to come.<\/p>\n<p data-start=\"5272\" data-end=\"5402\" data-is-last-node=\"\" data-is-only-node=\"\">And if your sash windows are sticking, rattling or showing signs of decay, restoration may be far more practical than replacement.<\/p>\n<div class=\"sws_supernormalaction\"><button on=\"tap:superwebshare-lightbox\" class=\"superwebshare_normal_button1 superwebshare-button-large superwebshare-button-default superwebshare_prompt superwebshare_button_svg\" style=\"color:#ffffff;background-color: #1e73be;\" ><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"superwebshare-svg\"  fill=\"currentColor\" viewBox=\"0 0 1000 1000\" stroke=\"currentColor\" stroke-width=\"0\"><path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M789.86,323.67c91.79,0,164.25-72.46,164.25-164.25S881.64,0,789.86,0S625.6,72.46,625.6,164.25c0,4.83,0,14.49,0,24.15L306.76,371.98c-24.15-24.15-57.97-33.82-96.62-33.82c-91.79,0-164.25,72.46-164.25,164.25s72.46,164.25,164.25,164.25c38.65,0,72.46-14.49,96.62-33.82L625.6,821.26c0,9.66,0,14.49,0,19.32c0,86.96,72.46,159.42,159.42,159.42s159.42-72.46,159.42-159.42s-67.63-159.42-154.59-159.42c-33.82,0-67.63,9.66-96.62,33.82L374.4,526.57c0-9.66,0-19.32,0-24.15s0-14.49,0-24.15l318.84-188.41C717.39,314.01,751.21,323.67,789.86,323.67z\" \/><\/svg><span>Share<\/span><\/button><\/div>","protected":false},"excerpt":{"rendered":"<p>ShareTraditional sash windows can look stunning on Georgian and Victorian homes, but cleaning them properly is not always as straightforward as modern windows. If you have ever wondered how to clean sash windows from inside, the good news is that&#133;<\/p>\n","protected":false},"author":1406,"featured_media":15815,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[12],"tags":[],"class_list":["post-15814","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-home"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.0 (Yoast SEO v26.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>How to Clean Sash Windows From Inside Without Damaging Them<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.smithersofstamford.com\/blog\/how-to-clean-sash-windows-from-inside-without-damaging-them\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Clean Sash Windows From Inside Without Damaging Them\" \/>\n<meta property=\"og:description\" content=\"ShareTraditional sash windows can look stunning on Georgian and Victorian homes, but cleaning them properly is not always as straightforward as modern windows. 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